[Solved] Which research design has a limitation regarding being used to study many variables of interest at the same time? A) correlational B) experimental C) cross-sectional D) longitudinal Culture Medium: A substance, often a gel or liquid, designed to support the growth, storage, or transport of microorganisms or cells. Colony: A distinct group of microorganisms, visible with the naked eye, on the surface of a culture medium. Mordant: A substance used in dyeing and printing that fixes the dye in the fabric, improving colorfastness; or, when used figuratively, it describes a sharply caustic or incisive expression. KOH Mount: A laboratory technique used to diagnose fungal infections, involving the application of potassium hydroxide to a sample to clear the material and make fungi more visible under a microscope.